813_React官方文档_条件渲染

import React from 'react';
import Hello from './components/Hello';
import About from './components/About';

let islogin = 0;
export default function App() {
  //条件渲染，根据islogin的值判断显示哪个组件
  return <>{islogin ? <About /> : <Hello />}</>;
}